feat: 小程序前端显示分类标签

各页面增加垃圾信息分类标签显示：
- 检测结果页显示分类标签
- 批量识别页和CSV导出增加分类标签列
- 历史记录页显示分类标签
- 管理后台审核页显示分类标签

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

miniprogram/pages/history/index.js

@@ -26,6 +26,13 @@ const APPEAL_STATUS_TEXT = {
   rejected: '已驳回'
 }
 
+const CATEGORY_LABELS = {
+  fraud: '疑似诈骗',
+  harassment: '疑似骚扰',
+  advertisement: '疑似广告',
+  spam: '疑似垃圾'
+}
+
 const REASON_TYPE_OPTIONS = [
   { value: '', label: '请选择申诉理由类型' },
   { value: '正常活动文案', label: '正常活动文案' },
@@ -86,7 +93,8 @@ Page({
         created_text: (item.created_at || '').replace('T', ' ').slice(0, 19),
         spam_probability_text: this.formatPercent(item.spam_probability, 2),
         visibility_text: VIS_LABEL[item.visibility] || item.visibility,
-        appeal_status_text: APPEAL_STATUS_TEXT[item.appeal_status] || item.appeal_status
+        appeal_status_text: APPEAL_STATUS_TEXT[item.appeal_status] || item.appeal_status,
+        category_label: CATEGORY_LABELS[item.category] || ''
       }))
       this.setData({ list })
     } finally {